How Did the Ptolemaic Model Explain the Apparent Retrograde Motion

question 52

Multiple Choice

How did the Ptolemaic model explain the apparent retrograde motion of the planets?

• A) The planets moved along small circles that moved on larger circles around the Earth.
• B) The planets sometimes stopped moving and then reversed to move backward along their circular orbits.
• C) The model showed that apparent retrograde motion occurs as Earth passes by another planet in its orbit of the Sun.
• D) The planets resided on giant spheres that sometimes turned clockwise and sometimes turned counterclockwise.

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Definitions:

Connective Tissue

Body tissue that supports, connects, or separates different types of tissues and organs in an organism.

Urinary

Related to the system in the human body that produces, stores, and expels urine.

Circulatory

Pertaining to the system that circulates blood and lymph through the body, comprising the heart, blood vessels, and lymphatic vessels.

Immune

Relating to or denoting the body's system of defense mechanisms against pathogens, including the production of antibodies and the activation of white blood cells.